diff --git a/src/idl_misc/JPBLib_for_Dustemwrap/General/convert_mk_mjy.pro b/src/idl_misc/JPBLib_for_Dustemwrap/General/convert_mk_mjy.pro
new file mode 100644
index 0000000..2afc848
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+++ b/src/idl_misc/JPBLib_for_Dustemwrap/General/convert_mk_mjy.pro
@@ -0,0 +1,45 @@
+; Copyright 2007 IAS
+
+; This file is part of the Planck Sky Model.
+;
+; The Planck Sky Model is free software; you can redistribute it and/or modify
+; it under the terms of the GNU General Public License as published by
+; the Free Software Foundation; version 2 of the License.
+;
+; The Planck Sky Model is distributed in the hope that it will be useful,
+; but WITHOUT ANY WARRANTY, without even the implied warranty of
+; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+; GNU General Public License for more details.
+;
+; You should have received a copy of the GNU General Public License
+; along with the Planck Sky Model. If not, write to the Free Software
+; Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+;+
+;  Convert mK, either themodynamic or Rayleigh-Jeans in MJy/sr
+; 
+;
+;  @param lam {in}{required}{type=float} wavelength in micron
+;  @keyword sig_mK{in}{required}{type=float} signal in mK
+;  @keyword sig_Mjy{in}{optional}{type=float} ...
+;  @keyword RJ{in}{optional}{type=boolean} ...
+;  @keyword CMB_TH{in}{optional}{type=boolean} ...
+;
+;  @history <p> Written Guilaine Lagache, 2001</p>
+;-
+
+pro convert_mk_mjy, lam, sig_mk, sig_Mjy, RJ=RJ, CMB_TH = CMB_TH
+k=1.3806503e-23
+
+IF KEYWORD_SET(RJ) THEN $
+  ; mK Rayleigh-Jeans
+  sig_Mjy=sig_mk*1.e-3*2*k*1e20/(lam*1.e-6)^2.
+
+IF KEYWORD_SET(CMB_TH) THEN BEGIN
+  ; mK thermodynamique
+  PLANCK_VALUES=  planck_function(2.726,lam,dBdT_VALUES,units='micron',/MJY)
+  sig_Mjy=sig_mk*dbdt_values*1.e-3
+ENDIF
+
+END
+
--
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